The ARCA Rail was designed to give you the flexibility and ease of use that you need for mounting your rifle. Mount your Arca Swiss tri-pod or bi-pod, picatinny rail accessories, and a Harris bi-pod all on one mount! The ARCA 3-Way Rail beautifully incorporates 3 of your popular accessory mounting options. We've all been there, having to take off a bi-pod mount and switch to a tri-pod mount at the most inconvenient time. Now, you have an all in one solution to mounting your rifle, no hassles guaranteed.